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Other Comprehensive Income (Loss) - Components of other comprehensive income (Details) - USD ($)
$ in Millions
 3 Months Ended
Mar. 31, 2025
Mar. 31, 2024
Before tax amount:    
Unrealized holding gains (losses) arising during period, before tax $ 245 $ (151)
Less reclassification of net realized gains included in net income, before tax (63) (34)
Foreign currency translation adjustments, before tax 26 (33)
Other comprehensive income (loss), before tax 334 (150)
Tax expense (benefit):    
Unrealized holding gains (losses) arising during period, tax 11 (10)
Less reclassification of net realized gains included in net income, tax (11) (5)
Foreign currency translation adjustments, tax 0 0
Other comprehensive income (loss), tax 22 (5)
Net of tax amount:    
Unrealized holding gains (losses) arising during period, net of tax 234 (141)
Less reclassification of net realized gains included in net income, net of tax (52) (29)
Foreign currency translation adjustments, net of tax 26 (33)
Net current period other comprehensive income (loss) $ 312 $ (145)